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Reports assignment to, or modification of fields that are declared in a superclass from within a subclass constructor.
<p>It is considered preferable to initialize the fields of a superclass in its own constructor and
  delegate to that constructor in a subclass. This will also allow declaring a field <code>final</code>
  if it isn't changed after the construction.</p>
<p><b>Example:</b></p>
<pre><code>
  class Super {
    int x;
  }
  class Sub extends Super {
    Sub(int _x) {
      // Warning: x is declared in a superclass
      x = _x;
    }
  }
</code></pre>
<p>To avoid the problem, declare a superclass constructor:</p>
<pre><code>
  class Super {
    final int x;

    Super(int _x) {
      x = _x;
    }
  }
  class Sub extends Super {
    Sub(int _x) {
      super(_x);
    }
  }
</code></pre>
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